High Power Laser Science and Engineering, Volume. 9, Issue 3, 03000e39(2021)

Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system

Yinxu Bian1,2, Kerong Jiao1,2, Xuecheng Wu1,2, Hua Shen1,2,3、*, Feiyan Yang1,2, and Rihong Zhu1,2
Author Affiliations
  • 1School of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing210094, China
  • 2MIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing210094, China
  • 3Department of Material Science and Engineering, University of California Los Angeles, Los Angeles, CA90095, USA
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    Figures & Tables(7)
    Schematic diagram of the structure of PS-LPFG. When the output laser transmits through the PS-LPFG, the broadened laser will be coupled from the core to the cladding and the signal laser continues to transmit.
    Simulated transmission spectrum of (a) LPFG and PS-LPFG with resonance wavelength 1080 nm at a period of 578 μm and a period number of 140; (b) PS-LPFGs with different periods at a period number of 140 and an index modulation amplitude of 8 × 10–5; (c) PS-LPFGs with different period numbers at a period of 578 μm and an index modulation amplitude of 8 × 10–5; and (d) PS-LPFGs with different index modulation amplitudes at a period of 578 μm and a period number of 140.
    Inscribing system of PS-LPFG based on a point-by-point scanning technique.
    (a) Temperature curve of dynamic-high-temperature annealing and (b) transmission spectrum of the fabricated PS-LPFG after annealing.
    High-power MOPA system for evaluating performance of suppressing spectral broadening.
    Output spectra of the evaluation system (a) without and (b) with PS-LPFG and comparison of the output spectra with and without the PS-LPFG at the highest power (c) in the range of signal laser and (d) in the range of SRS, and (e) output power versus pump power without or with PS-LPFG with the beam quality and profile of the output.
    • Table 1. Linewidth of output laser before and after splicing the PS-LPFG (at maximum output power).

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      Table 1. Linewidth of output laser before and after splicing the PS-LPFG (at maximum output power).

      LinewidthLinewidth
      PositionwithoutwithDifferenceDifference
      (dB)PS-LPFG (nm)PS-LPFG (nm)(nm)(%)
      33.083.070.010.32
      106.215.320.8914.33
      137.765.781.9825.52
      2011.187.873.3129.61
      3016.1210.006.1237.97
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    Yinxu Bian, Kerong Jiao, Xuecheng Wu, Hua Shen, Feiyan Yang, Rihong Zhu. Utilizing phase-shifted long-period fiber grating to suppress spectral broadening of a high-power fiber MOPA laser system[J]. High Power Laser Science and Engineering, 2021, 9(3): 03000e39

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    Paper Information

    Category: Research Articles

    Received: Nov. 30, 2020

    Accepted: Apr. 29, 2021

    Published Online: Jul. 15, 2021

    The Author Email: Hua Shen (edwardbayun@163.com)

    DOI:10.1017/hpl.2021.26

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